// 单例, 饿汉模式
// 唯一实例创建时机非常早. 类似于饿了很久的人, 看到吃的就赶紧开始吃. (急迫)
class Singleton {
    private static Singleton instance = new Singleton();

    public static Singleton getInstance() {
        return instance;
    }

    private Singleton() {

    }
}

public class Demo27 {
    public static void main(String[] args) {
        Singleton s1 = Singleton.getInstance();
        Singleton s2 = Singleton.getInstance();
        System.out.println(s1 == s2);

        // Singleton s3 = new Singleton();
    }
}